Physics: Principles with Applications (7th Edition)

by
Giancoli, Douglas C.

Answer

Choice D.

Work Step by Step

The penny is still moving in a circle, so there is a centripetal force toward the center of the turntable. However, the penny is also slowing down, so it feels a force directed opposite to its instantaneous velocity, pointing down the page/screen. The two forces add together to give a net force as shown in Choice D.